BeverageCups to Grams

Rum (40% ABV) Cups to Grams

Updated: July 28, 2026 · Source: 40% ABV ethanol-water density approximation (Rum density near 40% ABV.)

Snapshot

1 cup of rum (40% abv) equals 225.7 grams. Conversion Encyclopedia keeps one fixed beverage basis on this page so the calculator, common values, and reverse page stay aligned.

Reference basis: 0.954 g/mL.
Example: 2 cups = 451.41 g.
This uses Rum (40% ABV) at 40% ABV (not pure ethanol), so density differs from alcohol-only references.

Use the interactive calculator below for custom values and the common-value table for quick checks.

Interactive conversion

Converter Calculator

225.7 Grams

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225.7 grams

With 1 cup of Rum (40% ABV), that equals 225.7 grams.

Machine access

Available to apps and AI agents

Rum (40% ABV) Cups to Grams can be requested through Conversion Encyclopedia's structured interfaces by software and compatible AI agents. The rum-40 identifier tells the conversion engine which ingredient record to use for the same calculation shown by the calculator.

Machine-readable identifiers

Conversion family: beverage
Source unit: cup_us
Target unit: gram
Ingredient: rum-40

The JSON API and OpenAPI specification use the identifiers to reach the conversion engine. WebMCP lets compatible AI agents request the same calculation.

Example API request and response

POST /api/v1/convert

Request

{
  "family": "beverage",
  "value": 1,
  "from": "cup_us",
  "to": "gram",
  "material": "rum-40"
}

Essential response

{
  "ok": true,
  "conversion": {
    "family": "beverage",
    "value": 1,
    "from": "cup_us",
    "to": "gram",
    "result": {
      "raw": 225.704952,
      "display": "225.7"
    },
    "canonicalPath": "/beverage/cups-to-grams/rum-40/"
  }
}

Full API documentation

Explanation

Convert US cups of rum (40% abv) to grams using a density reference of 0.954 g/mL. With the US cup fixed at 236.588 mL, that gives 225.7 grams per cup for this ingredient.

That is especially useful for cocktail specs, batching sheets, and inventory work where rum (40% abv) starts from weight but service still uses poured measures. Rum (40% ABV) is treated here as 40% ABV, so stronger or lower-proof bottles can shift the practical density slightly.

Method & Density Basis

Density basis: 0.954 g/mL (anchored to US cup 236.588 mL and US fl oz 29.57 mL).
Applied factor: 1 Cup = 225.7 Grams.
Consistency rule: mirror pages invert the same per-liquid constants so forward and reverse directions remain aligned.
Source: 40% ABV ethanol-water density approximation (Rum density near 40% ABV.)

Common Conversion Values

Cups	Grams
1/4	56.43
1/3	75.23
1/2	112.85
3/4	169.28
1	225.7
1 1/2	338.56
2	451.41
3	677.11
4	902.82

Methodology

Rum (40% ABV) density evidence

Rum (40% ABV) uses 0.954 g/mL in this dataset, which is 4.6% lighter by volume than the 1 g/mL water reference. Evidence status: medium-confidence. Source basis: Rum density near 40% ABV.

Brand formulation, alcohol or sugar concentration, carbonation, and serving temperature can change the weight of a measured volume. Use this value as a documented reference rather than a producer specification.

Questions & answers

Frequently Asked Questions

How many grams are in 1 cup of Rum (40% ABV)?

1 US cup of Rum (40% ABV) is 225.7 grams using the density reference for this converter.

What density basis does this cup conversion use for Rum (40% ABV)?

It uses a density of 0.954 g/mL with the US cup standard (236.588 mL).

How many grams are in 2 cups of Rum (40% ABV)?

2 US cups of Rum (40% ABV) are 451.41 grams using the density reference for this converter.

How do I convert Rum (40% ABV) grams back to cups?

Use the mirror Grams To Cups page; for this ingredient, 1 g = < 0.01 cups.